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1. The Wide-field Spectroscopic Telescope (WST) Science White Paper

Author

Mainieri, Vincenzo, Anderson, Richard I., Brinchmann, Jarle, Cimatti, Andrea, Ellis, Richard S., Hill, Vanessa, Kneib, Jean-Paul, McLeod, Anna F., Opitom, Cyrielle, Roth, Martin M., Sanchez-Saez, Paula, Smiljanic, Rodolfo, Tolstoy, Eline, Bacon, Roland, Randich, Sofia, Adamo, Angela, Annibali, Francesca, Arevalo, Patricia, Audard, Marc, Barsanti, Stefania, Battaglia, Giuseppina, Aran, Amelia M. Bayo, Belfiore, Francesco, Bellazzini, Michele, Bellini, Emilio, Beltran, Maria Teresa, Berni, Leda, Bianchi, Simone, Biazzo, Katia, Bisero, Sofia, Bisogni, Susanna, Bland-Hawthorn, Joss, Blondin, Stephane, Bodensteiner, Julia, Boffin, Henri M. J., Bonito, Rosaria, Bono, Giuseppe, Bouche, Nicolas F., Bowman, Dominic, Braga, Vittorio F., Bragaglia, Angela, Branchesi, Marica, Brucalassi, Anna, Bryant, Julia J., Bryson, Ian, Busa, Innocenza, Camera, Stefano, Carbone, Carmelita, Casali, Giada, Casali, Mark, Casasola, Viviana, Castro, Norberto, Catelan, Marcio, Cavallo, Lorenzo, Chiappini, Cristina, Cioni, Maria-Rosa, Colless, Matthew, Colzi, Laura, Contarini, Sofia, Couch, Warrick, D'Ammando, Filippo, D., William d'Assignies, D'Orazi, Valentina, da Silva, Ronaldo, Dainotti, Maria Giovanna, Damiani, Francesco, Danielski, Camilla, De Cia, Annalisa, de Jong, Roelof S., Dhawan, Suhail, Dierickx, Philippe, Driver, Simon P., Dupletsa, Ulyana, Escoffier, Stephanie, Escorza, Ana, Fabrizio, Michele, Fiorentino, Giuliana, Fontana, Adriano, Fontani, Francesco, Sanchez, Daniel Forero, Franois, Patrick, Galindo-Guil, Francisco Jose, Gallazzi, Anna Rita, Galli, Daniele, Garcia, Miriam, Garcia-Rojas, Jorge, Garilli, Bianca, Grand, Robert, Guarcello, Mario Giuseppe, Hazra, Nandini, Helmi, Amina, Herrero, Artemio, Iglesias, Daniela, Ilic, Dragana, Irsic, Vid, Ivanov, Valentin D., Izzo, Luca, Jablonka, Pascale, Joachimi, Benjamin, Kakkad, Darshan, Kamann, Sebastian, Koposov, Sergey, Kordopatis, Georges, Kovacevic, Andjelka B., Kraljic, Katarina, Kuncarayakti, Hanindyo, Kwon, Yuna, La Forgia, Fiorangela, Lahav, Ofer, Laigle, Clotilde, Lazzarin, Monica, Leaman, Ryan, Leclercq, Floriane, Lee, Khee-Gan, Lee, David, Lehnert, Matt D., Lira, Paulina, Loffredo, Eleonora, Lucatello, Sara, Magrini, Laura, Maguire, Kate, Mahler, Guillaume, Majidi, Fatemeh Zahra, Malavasi, Nicola, Mannucci, Filippo, Marconi, Marcella, Martin, Nicolas, Marulli, Federico, Massari, Davide, Matsuno, Tadafumi, Mattheee, Jorryt, McGee, Sean, Merc, Jaroslav, Merle, Thibault, Miglio, Andrea, Migliorini, Alessandra, Minchev, Ivan, Minniti, Dante, Miret-Roig, Nuria, Ibero, Ana Monreal, Montano, Federico, Montet, Ben T., Moresco, Michele, Moretti, Chiara, Moscardini, Lauro, Moya, Andres, Mueller, Oliver, Nanayakkara, Themiya, Nicholl, Matt, Nordlander, Thomas, Onori, Francesca, Padovani, Marco, Pala, Anna Francesca, Panda, Swayamtrupta, Pandey-Pommier, Mamta, Pasquini, Luca, Pawlak, Michal, Pessi, Priscila J., Pisani, Alice, Popovic, Lukav C., Prisinzano, Loredana, Raddi, Roberto, Rainer, Monica, Rebassa-Mansergas, Alberto, Richard, Johan, Rigault, Mickael, Rocher, Antoine, Romano, Donatella, Rosati, Piero, Sacco, Germano, Sanchez-Janssen, Ruben, Sander, Andreas A. C., Sanders, Jason L., Sargent, Mark, Sarpa, Elena, Schimd, Carlo, Schipani, Pietro, Sefusatti, Emiliano, Smith, Graham P., Spina, Lorenzo, Steinmetz, Matthias, Tacchella, Sandro, Tautvaisiene, Grazina, Theissen, Christopher, Thomas, Guillaume, Ting, Yuan-Sen, Travouillon, Tony, Tresse, Laurence, Trivedi, Oem, Tsantaki, Maria, Tsedrik, Maria, Urrutia, Tanya, Valenti, Elena, Van der Swaelmen, Mathieu, Van Eck, Sophie, Verdiani, Francesco, Verdier, Aurelien, Vergani, Susanna Diana, Verhamme, Anne, Vernet, Joel, Verza, Giovanni, Viel, Matteo, Vielzeuf, Pauline, Vietri, Giustina, Vink, Jorick S., Vazquez, Carlos Viscasillas, Wang, Hai-Feng, Weilbacher, Peter M., Wendt, Martin, Wright, Nicholas, Ye, Quanzhi, Yeche, Christophe, Yu, Jiaxi, Zafar, Tayyaba, Zibetti, Stefano, Ziegler, Bodo, and Zinchenko, Igor

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Abstract

The Wide-field Spectroscopic Telescope (WST) is proposed as a new facility dedicated to the efficient delivery of spectroscopic surveys. This white paper summarises the initial concept as well as the corresponding science cases. WST will feature simultaneous operation of a large field-of-view (3 sq. degree), a high multiplex (20,000) multi-object spectrograph (MOS) and a giant 3x3 sq. arcmin integral field spectrograph (IFS). In scientific capability these requirements place WST far ahead of existing and planned facilities. Given the current investment in deep imaging surveys and noting the diagnostic power of spectroscopy, WST will fill a crucial gap in astronomical capability and work synergistically with future ground and space-based facilities. This white paper shows that WST can address outstanding scientific questions in the areas of cosmology; galaxy assembly, evolution, and enrichment, including our own Milky Way; origin of stars and planets; time domain and multi-messenger astrophysics. WST's uniquely rich dataset will deliver unforeseen discoveries in many of these areas. The WST Science Team (already including more than 500 scientists worldwide) is open to the all astronomical community. To register in the WST Science Team please visit https://www.wstelescope.com/for-scientists/participate, Comment: 194 pages, 66 figures. Comments are welcome (wstelescope@gmail.com)

Published
2024

9. Independent clinic-based evaluation of dual POCTs for screening for HIV and syphilis in men who have sex with men in Italy, Malta, Peru, and the United Kingdom

Author

Sherriff, Nigel, Mirandola, Massimo, Silva, Ronaldo, Cordioli, Maddalena, Sawyer, Alexandra, Gios, Lorenzo, Zorzi, Antonella, Huber, Jorg, Vera, Jaime, Richardson, Daniel, Hassan-Ibrahim, Mohammed, Wlazly, Dominika, Padovese, Valeska, Barbara, Christopher, Darmanin, Anabel, Schembri, Aaron, Caceres, Carlos, Vargas, Silver, Blondeel, Karel, Kiarie, James, Kurbonov, Firdavs, Peeling, Rosanna W., Thwin, Soe Soe, and Toskin, Igor

Published
2024
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13. On the dwarf irregular galaxy NGC 6822. I. Young, intermediate and old stellar populations

Author

Tantalo, Maria, Dall'Ora, Massimo, Bono, Giuseppe, Stetson, Peter B., Fabrizio, Michele, Ferraro, Ivan, Nonino, Mario, Braga, Vittorio F., da Silva, Ronaldo, Fiorentino, Giuliana, Iannicola, Giacinto, Marengo, Massimo, Monelli, Matteo, Mullen, Joseph P., Pietrinferni, Adriano, and Salaris, Maurizio

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Abstract

We present accurate and deep multi-band ($g,r,i$) photometry of the Local Group dwarf irregular galaxy NGC 6822. The images were collected with wide field cameras at 2m/4m- (INT,CTIO,CFHT) and 8m-class telescopes (SUBARU) covering a 2 square degrees FoV across the center of the galaxy. We performed PSF photometry of $\approx$7,000 CCD images and the final catalog includes more than 1 million objects. We developed a new approach to identify candidate field and galaxy stars, and performed a new estimate of the galaxy center by using old stellar tracers finding that it differs by 1.15 (RA) and 1.53 (DEC) arcmin from previous estimates. We also found that young (Main Sequence, Red Supergiants), intermediate (Red Clump, Asymptotic Giant Branch [AGB]) and old (Red Giant Branch [RGB]) stars display different radial distributions. Old stellar population is spherically distributed and extends to radial distances larger than previously estimated ($\sim$1 degree). The young population shows a well defined bar and a disk-like distribution, as suggested by radio measurements, that is off-center compared with old population. We discuss pros and cons of the different diagnostics adopted to identify AGB stars and develop new ones based on optical-NIR-MIR color-color diagrams (CCDs) to characterize Oxygen and Carbon (C) rich stars. We found a mean population ratio between Carbon and M-type (C/M) stars of 0.67$\pm$0.08 (optical/NIR/MIR) and we used the observed C/M ratio with empirical C/M-metallicity relations to estimate a mean iron abundance of [Fe/H]$\sim$-1.25 ($\sigma$=0.04 dex) that agrees quite well with literature estimates., Comment: Accepted for publication in ApJ, 34 pages, 22 figures, 6 tables

Published
2022
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15. Independent clinic-based evaluation of point-of-care testing for the screening of Chlamydia trachomatis, Neisseria gonorrhoea and Trichomonas vaginalis in women-at-risk in Australia, Guatemala, Morocco, and South Africa

Author

Shephard, Mark, Matthews, Susan, Kularatne, Ranmini, Andrewartha, Kelly, Blondeel, Karel, Alvarez, Christian, Camey, Elsy, Hançali, Amina, Müller, Etienne, Haw, Aurelie, Oumzil, Hicham, Golparian, Daniel, Ramirez, Dorian E, Kiarie, James, Kurbonov, Firdavs, Mirandola, Massimo, Peeling, Rosanna W, Silva, Ronaldo, Thwin, Soe Soe, Unemo, Magnus, and Toskin, Igor

Published
2024
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16. Clinic-based evaluation of the dual Xpert CT/NG assay on the GeneXpert System for screening for extragenital chlamydial and gonococcal infections amongst men who have sex with men

Author

Cordioli, Maddalena, Gios, Lorenzo, Erbogasto, Anna, Mirandola, Massimo, Sandri, Angela, Padovese, Valeska, Caceres, Carlos, Vargas, Silver, Blondeel, Karel, Silva, Ronaldo, Kiarie, James, Kurbonov, Firdavs, Peeling, Rosanna W., Thwin, Soe Soe, Golparian, Daniel, Unemo, Magnus, and Toskin, Igor

Published
2024
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28. The international reference system for beta-particle emitting radionuclides: Validation through the pilot study CCRI(II)-P1.Co-60

Author

Coulon, Romain, Leobino da Silva, Monica Aguiar, Bendall, Emma, Bergeron, Denis E., Bobin, Christophe, Bonková, Ivana, Bowan, Angus H.H., Ryszard, Broda, Capogni, Marco, Capone, Mauro, Carconi, Pierluigi, Cassette, Philippe, Jeffrey, T. Cessna, Clark, Emily L., Collins, Sean, Courte, Sammy, Czudek, Marek, da Silva, Carlos José, de Almeida Rangel, Johnny, De Felice, Pierino, Fan, Fuyou, Fazio, Aldo, Fitzgerald, Ryan P., Fréchou, Carole, Galea, Raphael, Gressier, Vincent, Iwahara, Akira, Judge, Steven M., Keevers, Christine M.B., Keightley, John, Kossert, Karsten, Krivošík, Matej, Kulkarni, D.B., Laureano-Perez, Lizbeth, Lech, Edyta, Leiras, Anderson, Liang, Juncheng, Lima da Cruz, Paulo Alberto, Lins da Silva, Ronaldo, Listkowska, Anna, Liu, Haoran, Liu, Meiling, Lubbe, Joline, Michotte, Carine, Moore, Kimberly, Nähle, Ole, Nonis, Manuel, Pearce, Andy, Pibida, Leticia, Quadros, André L.L., Ramirez, Natasha, Ravindra, Anuradha, Sabot, Benoit, Saganowski, Paweł, Sathian, V., Smith, Michael L., Sharma, Ritu, Takács, Marcell P., van Rooy, Milton W., Shearman, Robert, van Staden, Martin J., van Wyngaardt, W.M., Yang, Zhijie, Zarifi, Melek, Zhang, Ming, and Ziemek, Tomasz

Published
2023
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34. The Singing Effect during Melodic Dictation

Author

Lima, Fernando Gabriel Batista, Caregnato, Caroline, and Silva, Ronaldo da

Abstract

To sing while taking melodic dictation is a strategy employed by some Ear Training students as an aid, but there is a disagreement among the literature about its efficiency. Thus, it is important to disambiguate this question examining the contributions related to vocalization. The purpose of this research is to investigate the influence singing during melodic dictation can have over this activity, and to observe if this strategy contributes in a differentiated way for subjects in different development stages. An experimental study was conducted collectively with 68 undergraduates, which were divided in groups, one that was instructed to sing during dictation taking, and another that was instructed to stay in silence. Data collected were furthermore divided in sub-groups according to participants' study time. The results show that singing hinders the dictation performance, especially in students with less musical experience, because it deconcentrates and disturbs the individuals in the same room. Although, we suggest instructors to not discourage vocalization, and to recommend students to do it outside the classroom until they develop inner singing. Our study, however, counted on a reduced number of subjects. Future research with an increased number of participants could give rise to different conclusions.

Published
2021
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40. Milky Way metallicity gradient from Gaia DR2 F/1O double-mode Cepheids

Author

Lemasle, Bertrand, Hajdu, Gergely, Kovtyukh, Valery, Inno, Laura, Grebel, Eva. K., Catelan, Márcio, Bono, Giuseppe, François, Patrick, Kniazev, Alexei, da Silva, Ronaldo, and Storm, Jesper

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies
Abstract

The ratio of the first overtone (1O) / fundamental (F) periods of mixed-mode Cepheids that pulsate simultaneously in these two modes (F/1O) is metallicity-dependent. It can therefore be used to characterize the systems that host such variable stars. We want to take advantage of the F/1O double-mode Cepheids listed in the Gaia DR2 catalogue to derive the metallicity gradient in the Milky Way disk. The metallicity is derived from the ratio of the first overtone and fundamental periods provided by Gaia DR2 while the Gaia DR2 parallaxes are used to determine the Galactocentric distances of the stars. From a visual inspection of the light curves, it turns out that a large fraction (77%) of the Galactic F/1O double-mode Cepheids in Gaia DR2 are spurious detections. Gaia DR2 provides 3 new bona fide F/1O Cepheids. Combining them with the currently known F/1O Cepheids and using the Gaia DR2 parallaxes for the entire sample, we can derive the metallicity gradient in the Milky Way disk. We find a slope of -0.045$\pm$0.007 dex/kpc using a bootstrap method, and of -0.040$\pm$0.002 dex/kpc using a total least squares method. These results are in good agreement with previous determinations of the [Fe/H] gradient in the disk based on canonical Cepheids. The period ratio of F/1O Cepheids allows for a reliable determination of the metallicity gradient in the Milky Way, and in turn, in other systems that would be difficult to reach via classical spectroscopic methods., Comment: 10 pages, 8 figures, accepted in A&A

Published
2018
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46. Kidney function in tenofovir disoproxil fumarate-based oral pre-exposure prophylaxis users: a systematic review and meta-analysis of published literature and a multi-country meta-analysis of individual participant data

Author

Schaefer, Robin, Amparo da Costa Leite, Pedro Henrique, Silva, Ronaldo, Abdool Karim, Quarraisha, Akolo, Christopher, Cáceres, Carlos F, Dourado, Inês, Green, Kimberly, Hettema, Anita, Hoornenborg, Elske, Jana, Smarajit, Kerschberger, Bernhard, Mahler, Hally, Matse, Sindy, McManus, Hamish, Molina, Jean-Michel, Reza-Paul, Sushena, Azwa, Iskandar, Shahmanesh, Maryam, Taylor, Doug, Vega-Ramirez, Hamid, Veloso, Valdiléa G, Baggaley, Rachel, and Dalal, Shona

Published
2022
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50. Elevated thermal stability of the dielectric properties of CaMoO4–TiO2 composites under temperature variations.

Author

Nogueira, Francisco Enilton Alves, do Nascimento, João Paulo Costa, Abreu, Tallison Oliveira, Abreu, Roterdan Fernandes, Ghosh, Anupama, do Carmo, Felipe Felix, da Silva, Marcelo Antonio Santos, da Silva, Ronaldo Santos, Trukhanov, S. V., Zhou, Di, Singh, C., and Sombra, Antonio Sergio Bezerra

Abstract

In this article, the dielectric properties of the ceramic CaMoO4 (CMO) with additions of 0, 8, 12, and 20% by mass (wt %) of TiO2 in the radiofrequency (RF) region were studied. X-ray diffraction analysis showed that no secondary phases formed after the addition of TiO2. Scanning electron microscopy was used to analyse the effects on the morphology of the CMO. Complex Impedance Spectroscopy (CIS) was performed to evaluate the electrical properties of the materials, while temperature coefficient of capacitance (TCC) analysis showed that at 10 kHz, CMO12 (CMO with 12 wt % TiO2) presented a TCC equal to zero, demonstrating that this material is thermally stable at this frequency. The activation energy (Ea) was calculated by AC conductivity and imaginary part of the electric modulus (M″) at different temperatures. The Ea values were close, indicating that the thermally activated conduction process is the same. Moreover, the addition of TiO2 resulted in a decrease in the Ea, implying an increased conductivity of the material. The results obtained show that the materials evaluated would be interesting candidates for application in electronic circuits that operate in the radiofrequency region. [ABSTRACT FROM AUTHOR]

Published
2024
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